Abstract: The domestic oil companies of China are speeding up the pace of overseas oil exploration, and they face the problems of coordinate transformation with the increasing number overseas drilling. Practical methods are studied in this paper, in order to propose two kinds of simple but useful coordinate transformation methods, which are using commercial seismic interpretation software and self-programming software with known transformation code, based on the significance of coordinate transformation in the study area with fast horizontal change of reservoir. The results prove the two methods are effective less than 0.3 m error range verified by the known data. Those two methods are applied to well proposing of turbidity channel with imaging fuzzy boundary in X study area of deep water of West Africa, and the locations are correct under the drilling results.